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ARMATURE FOR DYNAMO ELECTRIC MACHINES. No. 848,883. Patented Sept. 7.1886.

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ARMATURB FOR DYNAMO ELECTRIC MACHINES. No. 348,883.

Patented Sept. 7, 1886.

Wlzmsea ifi N. PETERS Phuio-Liilmgnpher, Wasbingmn. uv c.

UNITED STATES AUGUST BOSSARD, OF NEW YORK,

PATENT OFFICE.

ARMATURE FOR DYNAMO-ELECTRIC MACHINES.

S JPECIFICATION forming part of Letters Patent No. 348,883, datedSeptember 7,1886.

Application filed May 10, 1886, Serial No. 202,780. (No model.)

To aZZ whom it may concern:

Be it known that I, AUG Us'r BossARn, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented certain new and useful improvements in Armatures forDynamo-Electric Machines; and I do hereby declare the following to be afull, clear, and exact description of theinvcntion, reference being hadto the accompanying drawings, which form part of this specification, inwhich- Figure 1 is an end view, partly in section, ofanarmatureembodying my invention. Fig. 2 is a side view showing a portionof said armature. Fig. 3 is a perspective view, partly in section, ofone of the armature-sections. Fig. 4. is a detail view. Fig. 5 is a planview of a blank for one of the troughs. Fig. 6 is a longitudinalsectional view of an armaturesection.

This invention has relation to armatures for dynamo-electric machines ofthe Gramme type-that is, armatures in which the core is composed of lineiron wire, as distinguished from a solid iron ring such as constitutesthe core of an armature of the laccinote type.

The object in using fine iron wire for the core is to obtain a rapiddischarge of magnetism, it being well known that a magnetic body, whensubdivided into many sections, will discharge itself more rapidly thanwill a solid homogeneous mass of the same material. I have found,however, that the fine-wire core of the Gui-mine armature as heretoforeconstructed is defective in this respect; that it does not discharge itsmagnetism when rapidly rotated quickly enough to accommodate itself tothe changes of polarity induced by the dissimilar polcs of the iield,and that there is a a constant transfer of magnetic polarityin thedifi'erent parts of the core corresponding to the approach toward andrecession from the poles of the field; but the lines of separation ofthese different parts are not well defined, and, owing to the wiresections or strands being contin'ir ous in the core, each part dependsto such an exteutupon the whole mass that the magnetic discharge is moreor less retarded.

The principal object of my invention is to promote and effect a morerapid and complete magnetic discharge of the wire core than hasheretofore been attained, and with this object in view my inventionprincipally consists, primarily, in subdividing the wire core intoseparate and independent sections corresponding to the spools of thearmature, each section being composed ofa suitable number ofshort linksor pieces of wire inclosed in a sheet-iron box or trough, around or uponwhich is wound the insulated wire composing the spool, by which means Iobtain an independent discharge for each and every spool, andeffectually avoid the retardation of the discharge following theemployment of the ordinary Gramme core.

My invention furthermore consists in the novel construction andarrangement of the sheetiron box or trough containing the short lengthsor sections of wire, so that their sides or flanges shall project orextend between the spools to the periphery of the armature, and therebyapproach close to the poles of the field, whereby the magnetism inducedby the latter in said flanges will be conducted into the core. By thismeans I overcome and obviate a defect in the ordinary Gramme core, whichis necessarily located so far away from the field-poles that it attainscomparatively little magnetic induction.

My invention finally consists in the novel construction and arrangementof the sections or parts comprising the spools, the sheet-iron box ortrough, and the fine-wire lengths whereby each seetion is separate andindependent of the others, and may therefore be easily re moved andreplaced without disturbing the latter for the purposes of repair orreadjustment.

Referring to the accompanying drawings, A designates an armature,constructed in sec tions, embodying my invention.

B designates the troughs or boxes to contain the core-wi res. Saidtroughs or boxes are preferably made of sheetiron, a suitably-shapedblank, 3, being bent or struck up so as to produce the side llangcs orwalls, b I), and the end flanges, Z). By notching or recessing the blankat its ends, as shown at c, and then cutting the longitudinal slits c online with the sides of the notches c, the trough B, when completed, willhave the side flanges, b 1), higher than the end flanges, Z1. Bolts,screws,

or rivets d serve to brace the side flanges and hold them in shape.

The trough or box 13 is made with its sides converging, so as to formradii with the center of the armature, and thus adapt the sections, ofwhich the boxes are a part, to fit together as Segments of the completearmature.

D represents the core-wires, which consist of short lengths of soft-ironwire of suitable diameter. These lengths are laid transversely in thetroughs B, filling thesame up to about the level of' the end flanges,and are covered and inclosed by a flanged cap or platc,,E, the flanges cof which embrace the end flanges of the trough. The armature coils orbobbins are then wound upon the troughs lengthwise of and between theside flanges until the space above the cap E is filled. Below the sideflanges strips of vulcanite fiber or other ma terial, f, is applied tothe sections, and converge radially to correspond. These strips serve toconfine the inner portions of the bobbin-wires and preserve thewedge-shape c011- formation of the sections.

The extended walls or side flanges of the troughs are the mediumsthrough which the armature-sections are secured to thearmatureheads, andare therefore bent or indented at d to form semi cylindrical recesses,which, when the sections are in place, produce cylindrical sockets atthe ends of every two adjacent sections. Through these sockets bolts 0rscrews 9 are inserted and fastened to the armature-heads G. Thclatt-er,as shown, are formed with radial kerfs 71., of rounded form, to receivethe indented ends of the flanges b b. The latter, being fitted in place,are held by the screws or bolts 9, the heads of which abut against orrest upon the upper edges ofthe flanges. By simply removing the screwsthe sections may each be displaced intact, obviating the necessity oftaking the whole armature apart should one section be burned out orotherwise injured, so as to require repair or replacement by a newsection. The terminals of the bobbins are led through the armature-headsand. connected to thecommutator-sections in the usual way. \Vhen all thesections arein place and fastened at their ends, they may be boundtogether at points between the armature-heads by suitable bands, II,resting on cushions of vulcanite fiber or other material.

.It will be seen from the foregoing description and accompanyingillustrations that I have provided an armature in which I obtain all theadvantages of a G-ramme or subdivided core, while I at the same timeeffectually overcome certain imperfections which greatly impair theefficiency of the fine-wire core.

By my method of subdividing or separating the wires of the core intosmall lengths corresponding-to the respective bobbins I prevent thewhole core from maintaining throughout the magnetic charge whichotherwise follows the entrance of a bobbin within the magnetic field,and hence obtain a discharge of the mag netism of each sectionseparately. This discharge is very rapid, owing to the diminished lengthof the core-sections, and is therefore productive of advantageousresults not hitherto attainable. Again, by continuing the side flangesof the troughs out between the bobbins t0 the periphery of the cylinderI bring the core virtually within the full influence of the field, sincethe flanges, being in contact with the core, serve to conduct the inductive effects of the field-magnet to the latter and highly magnetizethe same. Then the usual form of Gramme core is employed,thewircs of thebobbins surround the samc, and of necessity the core is a distance fromthe field-magnet proportioned to the size of the bobbin and the numberof windings.

\Vhat I claim as my invention is 1. An armature for dynamo-electricmachines, comprising a series of separate and independent sectionsfitted between disks or heads, each section composed of a soft-irontrough or box containing a number of short soft-iron wires formingdivisions of the core, the sides of said troughs or boxes projectingradially to or near the periphery of the armature, so as to bring thecore fully within the magnetic field, substantially as and for thepurpose described.

2. In an armature for dynamo-electricmachines, a core composed of shortlengths of soft-iron wire, in combination with the surrounding spools orbobbins, and with troughs,

boxes, or frames whose side flanges lie between the bobbins andterminate at or near the periphery of the armature, substantially as described.

3. In an armature for dynamo-electric machines, the combination, withthe heads or disks having radial parts, the armature-core, and thespools or bobbins, of plates or flanges separating and embracing saidbobbins or spools, said plates or flanges having their ends recessed,bent, orindented, so asto form sockets for the reception of boltsorscrews by which they are fastened to the armature-heads.

In testimony that -I claim the foregoing I have hereunto set my handthis 14th day of May, 1886.

Aueusr BossARD.

\Vitnesses:

HENRY HASLER, PAUL HAERRY.

